Light from a point source X contains only blue and red components.After passing through a mysterious box, the light falls on a screen.Red and blue hands are observed as shown.The box must contain: 
Definitions:
Social Expectancies
Presumptions or anticipations about the behaviors that are deemed acceptable or normal within a social context or group.
Self-Fulfilling Prophecy
A belief or expectation that influences actions in a way that causes the belief to become a reality.
Accuracy Moderator
A variable that can influence the correlation between two measures, potentially affecting the precision of outcomes or predictions.
Judgeability Phenomena
The tendency for observers to make judgments or assumptions about others' traits or characteristics, often based on limited information.
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